Mute unharmful build warning at the top of the build log:

diff: out/target/product/generic/obj/PACKAGING/updater_extensions_intermediates/register.inc.list:
No such file or directory

Change-Id: I269b1703b6091b343db45b1c5cdd0962c738788b
diff --git a/updater/Android.mk b/updater/Android.mk
index dcc6a49..c8f61f4 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -51,7 +51,7 @@
 
 junk := $(shell mkdir -p $(dir $(inc));\
 	        echo $(TARGET_RECOVERY_UPDATER_LIBS) > $(inc).temp;\
-	        diff -q $(inc).temp $(inc).list || cp -f $(inc).temp $(inc).list)
+	        diff -q $(inc).temp $(inc).list 2>/dev/null || cp -f $(inc).temp $(inc).list)
 
 $(inc) : libs := $(TARGET_RECOVERY_UPDATER_LIBS)
 $(inc) : $(inc).list